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-rw-r--r--crypto/ahash.c194
1 files changed, 194 insertions, 0 deletions
diff --git a/crypto/ahash.c b/crypto/ahash.c
new file mode 100644
index 00000000000..27128f2c687
--- /dev/null
+++ b/crypto/ahash.c
@@ -0,0 +1,194 @@
+/*
+ * Asynchronous Cryptographic Hash operations.
+ *
+ * This is the asynchronous version of hash.c with notification of
+ * completion via a callback.
+ *
+ * Copyright (c) 2008 Loc Ho <lho@amcc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+#include "internal.h"
+
+static int hash_walk_next(struct crypto_hash_walk *walk)
+{
+ unsigned int alignmask = walk->alignmask;
+ unsigned int offset = walk->offset;
+ unsigned int nbytes = min(walk->entrylen,
+ ((unsigned int)(PAGE_SIZE)) - offset);
+
+ walk->data = crypto_kmap(walk->pg, 0);
+ walk->data += offset;
+
+ if (offset & alignmask)
+ nbytes = alignmask + 1 - (offset & alignmask);
+
+ walk->entrylen -= nbytes;
+ return nbytes;
+}
+
+static int hash_walk_new_entry(struct crypto_hash_walk *walk)
+{
+ struct scatterlist *sg;
+
+ sg = walk->sg;
+ walk->pg = sg_page(sg);
+ walk->offset = sg->offset;
+ walk->entrylen = sg->length;
+
+ if (walk->entrylen > walk->total)
+ walk->entrylen = walk->total;
+ walk->total -= walk->entrylen;
+
+ return hash_walk_next(walk);
+}
+
+int crypto_hash_walk_done(struct crypto_hash_walk *walk, int err)
+{
+ unsigned int alignmask = walk->alignmask;
+ unsigned int nbytes = walk->entrylen;
+
+ walk->data -= walk->offset;
+
+ if (nbytes && walk->offset & alignmask && !err) {
+ walk->offset += alignmask - 1;
+ walk->offset = ALIGN(walk->offset, alignmask + 1);
+ walk->data += walk->offset;
+
+ nbytes = min(nbytes,
+ ((unsigned int)(PAGE_SIZE)) - walk->offset);
+ walk->entrylen -= nbytes;
+
+ return nbytes;
+ }
+
+ crypto_kunmap(walk->data, 0);
+ crypto_yield(walk->flags);
+
+ if (err)
+ return err;
+
+ walk->offset = 0;
+
+ if (nbytes)
+ return hash_walk_next(walk);
+
+ if (!walk->total)
+ return 0;
+
+ walk->sg = scatterwalk_sg_next(walk->sg);
+
+ return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_done);
+
+int crypto_hash_walk_first(struct ahash_request *req,
+ struct crypto_hash_walk *walk)
+{
+ walk->total = req->nbytes;
+
+ if (!walk->total)
+ return 0;
+
+ walk->alignmask = crypto_ahash_alignmask(crypto_ahash_reqtfm(req));
+ walk->sg = req->src;
+ walk->flags = req->base.flags;
+
+ return hash_walk_new_entry(walk);
+}
+EXPORT_SYMBOL_GPL(crypto_hash_walk_first);
+
+static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct ahash_alg *ahash = crypto_ahash_alg(tfm);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+ int ret;
+ u8 *buffer, *alignbuffer;
+ unsigned long absize;
+
+ absize = keylen + alignmask;
+ buffer = kmalloc(absize, GFP_ATOMIC);
+ if (!buffer)
+ return -ENOMEM;
+
+ alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
+ memcpy(alignbuffer, key, keylen);
+ ret = ahash->setkey(tfm, alignbuffer, keylen);
+ memset(alignbuffer, 0, keylen);
+ kfree(buffer);
+ return ret;
+}
+
+static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct ahash_alg *ahash = crypto_ahash_alg(tfm);
+ unsigned long alignmask = crypto_ahash_alignmask(tfm);
+
+ if ((unsigned long)key & alignmask)
+ return ahash_setkey_unaligned(tfm, key, keylen);
+
+ return ahash->setkey(tfm, key, keylen);
+}
+
+static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type,
+ u32 mask)
+{
+ return alg->cra_ctxsize;
+}
+
+static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+ struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash;
+ struct ahash_tfm *crt = &tfm->crt_ahash;
+
+ if (alg->digestsize > PAGE_SIZE / 8)
+ return -EINVAL;
+
+ crt->init = alg->init;
+ crt->update = alg->update;
+ crt->final = alg->final;
+ crt->digest = alg->digest;
+ crt->setkey = ahash_setkey;
+ crt->digestsize = alg->digestsize;
+
+ return 0;
+}
+
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+ __attribute__ ((unused));
+static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg)
+{
+ seq_printf(m, "type : ahash\n");
+ seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
+ "yes" : "no");
+ seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
+ seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
+}
+
+const struct crypto_type crypto_ahash_type = {
+ .ctxsize = crypto_ahash_ctxsize,
+ .init = crypto_init_ahash_ops,
+#ifdef CONFIG_PROC_FS
+ .show = crypto_ahash_show,
+#endif
+};
+EXPORT_SYMBOL_GPL(crypto_ahash_type);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous cryptographic hash type");